The older Stators and flywheels were smaller than the newer units, just from memory I would say the newer is close to 5" and the older is like 4" in diameter
older stators 88 and older had 4 wires from the stator: black/red, white/green, white/red, and black/yellow
newer stators 89 and newer had 3 wires: white/red, black/yellow, and black/white